1145633221 has 2 divisors, whose sum is σ = 1145633222. Its totient is φ = 1145633220.

The previous prime is 1145633207. The next prime is 1145633231. The reversal of 1145633221 is 1223365411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 929396196 + 216237025 = 30486^2 + 14705^2 .

It is an emirp because it is prime and its reverse (1223365411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1145633221 - 2⁵ = 1145633189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1145633221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145633231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572816610 + 572816611.

It is an arithmetic number, because the mean of its divisors is an integer number (572816611).

Almost surely, 2^1145633221 is an apocalyptic number.

It is an amenable number.

1145633221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145633221 is an equidigital number, since it uses as much as digits as its factorization.

1145633221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 1145633221 is about 33847.2040351932. The cubic root of 1145633221 is about 1046.3617758524.

Adding to 1145633221 its reverse (1223365411), we get a palindrome (2368998632).

The spelling of 1145633221 in words is "one billion, one hundred forty-five million, six hundred thirty-three thousand, two hundred twenty-one".